Perl security

If one user installs a perl script in his cgi-bin (e.g. /web1/user1/), he as access to all other webs. This is a security risk - any idea how to prevent?
(ispconfig 3, 3.0.1.3, Ubuntu 8.04.1 Hardy Heron)

Use the svn version from ispconfig which has a high security mode setting which should be able to prevent this. If this is a production server you should wait for the 3.0.1.4 release, which will contain the new mode as well. Also make sure that you enabled suexec.